Where do I know that tune from: Prelude from Saint-Saens's Christmas Oratorio

Largely thanks to the descriptive title, I’ve said almost everything I want to ask. If you listen to the first few bars (and the repetitions of those bars), is there anything that springs to your mind? I could literally swear (did it yesterday) that I’ve heard that melody set to lyrics, maybe in a movie soundtrack…I want to say it goes something like “dadada as free as the wind blows”…

Please, someone, help!

I don’t know the tune, but the lyrics you quote are from the theme song to “Born Free” (1966), and the TV series that followed on from it.